Early in the morning, the fleet of the East China Sea Division, sailing all the way down the coast of Ezo, finally reached the northern part of the Whale Sea, which later became the Strait of Tatars.

Later Japan called it the Manomiya Strait, and the polar bear called it the Nevelskoy Strait.

It is said to be a body of water between Sakhalin and the mainland, and after this north-south strait, it is the Sakhalin Bay in later generations, and then the Sea of Okhotsk. But now these places have been named "Beihai" by Zhao Gou!

The wind on the sea is very cold, the temperature of the sea is also very low, it is the end of March, the Central Plains is already in full bloom, but here it is still like the early spring. However, the ice on the surface of the sea is completely dissolved.

Liu Ziyu stood at the bow of the boat, looking at the coastline map drawn by the staff officers, and looking at the surrounding sea.

From entering the Tatar Strait to the destination of the Tongjiang estuary, there are also more than 1,000 miles by sea.

"Nu'er Gancheng!"

This is the northernmost city of the Tongjiang River, which was built in the hands of the Liao people, and now belongs to the Jin people. It can be regarded as a stronghold of the surrounding tribes of the Jurchen to grasp the mouth of the Tongjiang River, and the surrounding small tribes have to pay tribute to the Wanyan Jurchens every year, and it is also a frontier base for the Wanyan clan to capture the Huli Gai people.

Because the area north of the Tongjiang River is too vast, and at the same time, the environment is too harsh. The tribes here are also restless, just like the Liao people have to endure the backlash of the grassland tribes, the Jin people don't see that they are white mountains and black waters, but they also have to be troubled by the tribes farther north than them.

As early as when Aguta had not yet raised an army to rebel against the Khitans, Wanyan Jurchen had to send troops from time to time to pacify the tribes that disobeyed him in the Tongjiang Valley, and at the same time, this was also a way for Wanyan Jurchen to expand his strength.

These captured wild Jurchens are even wilder existences than Wanyan Jurchens.

Life and death are downbeat, and they are indomitable. For those savages, the 'comfortable' days of the Jurchens are earned for a day. And after they died, their families and even tribes had a lot of benefits, which made them even more fearless of death.

The Huligai people, who are located in the area of the mouth of the Tongjiang River, are a tribe that is further north than the wild Jurchen. And in the Jurchen people's 'national concept', they and the Huligai people are not the same nation at all.

During the period of Wanyan's impeachment of Libo (Akuta's father), in order to remove the threat of Huligai behind his back, he wanted to use the strategy of in-law to tie the favor of Wuchun among the Huligai, but was scolded by Wuchun as a pig and dog: "The son of Gobi is in the same place, how can he have children?" How can Huligai and the female straight be close? ”

Then Hu Li Gai was impeached by Wanyan and exhausted his life's work, and he fell apart and could not reunite, and he could no longer become a threat to Wanyan Nuzhen.

And what about the impeachment of Wanyan? From the beginning of his succession to the throne and sitting as the envoy of the Jurchen Festival, the Huli people took advantage of the gap to attack, defeated the rebellion inside and outside, and established diplomatic relations. Huan Yu, Sanda, Wuchun, Womouhan and other Huli reform tribes, each of which was a strong enemy that the Jurchen tribal alliance had to face seriously at that time. But in the confrontation year after year, Huan Xun, Sanda, Wuchun, Womouhan and other Huli reform departments disappeared one by one along the Tongtong River.

In the seventh year of Liao Da'an, Hu Li's people completely surrendered to the feet of Wanyan Nuzhen, and in the eighth year of Da'an, Wanyan's impeachment bowl was hanging. The one on the other end can be said to be a lifelong enemy.

But at this time and at that time, now even Ah Guda has been hanging for six or seven years, and thirty or forty years have passed, and in such a bitter cold place, thirty or forty years is the situation of a whole generation. Liu Ziyu kept muttering some tribal names in his mouth, which was a bit of information that Jinyiwei had finally found, but no one could say whether it was accurate or not.

He really can't predict whether he will be able to take some of the Huli people for his own use in the next time? Maybe the Huli Gai people have long forgotten their grievances with the Jurchens.

In this way, time is in Liu Ziyu's conjecture, passing day by day. Until he saw the mouth of the mixed river.

In the afternoon of the next day, two small sea-going boats lowered most of their sails one after the other, and lowered a few small boats to measure the depth of the river. It's better to be cautious.

Liu Ziyu held a clairvoyant mirror and looked at both sides of the river, and found no traces of the aborigines, but the shore was full of dense green pines and birch forests, and the tall and straight posture made people feel shocked. At the same time, he could see a large swamp area, and the grass that had just turned green seemed to grow directly in the water, and the patches of green and the patches of water and light were mixed together, and they stretched far away to the shore, so that the clairvoyant mirror could not see the reflection of the water light.

The flow and depth of the mixed river are by no means surpassing by the boats of this era.

"The first thing I did when I went ashore was to set up tents, cut wood, build houses, and set up a big camp, didn't I need to tell you?" Liu Ziyu was wrapped in a fur coat and wore black leather shoes, walking on the soft grass mixed with the south of the Yangtze River.

This land is not of much strategic importance, at most it is just a stop. Because this is the outermost edge of the mouth of the Tongjiang River, the terrain is low, just like Pudong in the magic capital. Whether it's tidal erosion, seawater intrusion, or the arrival of a wet season, the safety hazards of the lower elevations prove that this place is not suitable for large-scale ground construction.

There is also a flood season in the mixed river. Whether it is heavy rain (rainfall) in summer, melting ice and snow after the beginning of spring, or even ice and ice after the temperature plummets, it can also produce large floods.

What's more, the estuary of this mixed river is a big horn, and what really has strategic value is not such a horn, but the inner horn. That is, the location of the temple street in later generations.

Whether it is from the geographical environment or from the geographical advantage, it can crush the current foothold. As for the strategic elements, it is even more crushed and crushed.

When Liu Ziyu took a boat to the mouth of the horn, he took a fancy to the area on the north shore at first sight, and the large plain was beyond the boundary. And it is stuck in the mouth of the mixed river, which is definitely an excellent place to control the area of the mouth of the mixed river.

As for Nuergancheng, of course, it was also a good place, but in order for the Zhao and Song dynasties to maintain control over the lower reaches of the Tongtong River, their strategic direction was different from the land conquest routes taken by the Khitans and Jurchens, and the most cost-effective way was to take the water and sea routes.

Although this place is not navigable for half of the year. However, the only half-year navigation time is enough for Zhao Song to turn around.

Because of today's science and technology, the only thing that can be coveted by the people of the Central Plains in the Outer Northeast is the fur here.

The so-called domination, the so-called management, in the final analysis, is a simple exchange of goods based on high profits, and perhaps the employment of the young and strong people here. Just like Zhao Song did to Hengshan Zhufan.

The former contains huge economic benefits, while the latter has certain strategic and political significance.

"But these are long-term considerations...... Liu Ziyu took a sip of the liquor leisurely, and his whole body immediately became hot.

Although he is the governor of Haidong, it is uncertain whether the jurisdiction of the lower reaches of the river will be attributed to the Haidong Governor's Mansion or to the Andong Metropolitan Protectorate, and even if he is not careful, the Haidong Governor's Mansion will be under the jurisdiction of the Andong Metropolitan Protectorate. Everything depends on whether the capital protection mansion is just the capital protection mansion, or whether there will be one more word and become the metropolitan protection mansion.