Kamikochi

Today I will go to Kamikochi with my friends.

Kamikochi is one of largest depositional plains in Japan, the altitude of which is around 1500 meters.

It is thought that a river dammed by eruption activities and made a pond, then sediments deposited there.

The winter in Kamikochi is very cold -- the average temperature in January is -7.7 ℃, and the lowest temperature is below -30 ℃.

On the other hand, the average temperature in summer is around 20 ℃, so you can go sightseeing comfortably.

However, note that the average temperature of some areas don't exceed 10 ℃, that is a tundra climate.

Since Kamikochi is very beautiful, when you come to Nagano prefecture, please visit it.

上高地

今日は友人と上高地に行く予定です。

上高地は、標高1500ｍ程の位置する、日本最大級の堆積平野です。

かつて、川が噴火活動によってがせき止められ池となり、そこに土砂が堆積してできたものと考えられています。

冬は非常に寒さが厳しく、1月の平均気温は-7.7℃、最低気温は-30℃以下になります。

一方夏は平均気温が20℃ほどとなり、とても涼しく気持ちよく観光できます。

ただし、一部地域は最暖月の平均気温が10℃を超えず、ツンドラ気候となっています。

もし長野県に来る機会があれば、是非訪れてみて下さい。

• Kamikochi is one of largest depositional plains in Japan, the altitude of which is around 1500 meters.
• Kamikochi is one of the largest depositional plains in Japan, the altitude of which is around 1500 meters.

• It is thought that a river dammed by eruption activities and made a pond, then sediments deposited there.
• It is thought that a river dammed by eruption activities created a pond, then sediments deposited there.

• The winter in Kamikochi is very cold -- the average temperature in January is -7.7 ℃, and the lowest temperature is below -30 ℃.
• The winter in Kamikochi is very cold — the average temperature in January is -7.7 ℃, and the lowest temperature is below -30 ℃.

• However, note that the average temperature of some areas don't exceed 10 ℃, that is a tundra climate.
• However, note that the average temperature of some areas don't exceed 10 ℃, becuase it is a tundra climate.

• Today I will go to Kamikochi with my friends.
• This sentence is perfect! No correction needed!

• Kamikochi is one of largest depositional plains in Japan, the altitude of which is around 1500 meters.
• This sentence is perfect! No correction needed!

• It is thought that a river dammed by eruption activities and made a pond, then sediments deposited there.
• It is thought that a river dammed by eruption activities and made a pond, and then deposited sediments there.

  Your sentence is good.
  
  Another idea is to write it like this:
  
  "It is thought that eruption activities dammed up a river, forming a pond, causing sediments to be deposited there."

• The winter in Kamikochi is very cold -- the average temperature in January is -7.7 ℃, and the lowest temperature is below -30 ℃.
• This sentence is perfect! No correction needed!

• On the other hand, the average temperature in summer is around 20 ℃, so you can go sightseeing comfortably.
• This sentence is perfect! No correction needed!

• However, note that the average temperature of some areas don't exceed 10 ℃, that is a tundra climate.
• However, note that the average temperature of some areas don't doesn't exceed 10 ℃, that is a tundra climate.

I didn't even know what a depositional plain was. I had to look it up! Good word!

Kamikochi sounds beautiful! Now I want to go see it! =)