登山（とざん、tozan）
- mountain climbing

The Japanese word 登山 （とざん） literally translates to "mountain climbing" or "mountaineering." It refers to the activity of ascending mountains, often for recreational or sporting purposes. The term encompasses a wide range of activities, from leisurely hikes up gentle slopes to challenging ascents of high peaks requiring specialized equipment and skills. It includes various aspects such as hiking, trekking, and rock climbing depending on the difficulty and terrain.

⚫︎週末は友達と登山に行く予定です。 Translation: I plan to go mountain climbing with my friends this weekend. ⚫︎富士山に登山するのは大変ですが、景色は素晴らしいです。 Translation: Climbing Mount Fuji is difficult, but the view is amazing. ⚫︎登山用のリュックサックを買いました。 Translation: I bought a backpack for mountain climbing.

This word is used to describe the activity of 登山 or planning a 登山 trip. It is applicable when talking about going up a mountain, the gear needed, or the experience itself. You can use it in various contexts, from casual conversations to formal reports about mountain expeditions. It can also be used in more general terms to refer to any journey involving going up a mountain.

⚫︎The word 登山 is most commonly written in kanji. ⚫︎The reading is とざん in hiragana. ⚫︎The kanji 登 means "to climb" or "to ascend," while 山 means "mountain." ⚫︎There is no variation in the okurigana; it’s always written as 登山.

⚫︎ハイキング（haikingu）：Hiking (generally, walking on trails in nature) ⚫︎山登り（やまのぼり）：Mountain climbing (a more casual term) ⚫︎トレッキング（torekkingu）：Trekking (often refers to longer, multi-day hikes) ⚫︎クライミング（kuraimingu）：Climbing (can be specifically rock climbing, depending on the context)

⚫︎There isn't a direct antonym. You can say activities unrelated to mountains, or activities that involves going down. ⚫︎For example, 下山（げざん） – descending a mountain, but this is the opposite action of 登山, not the direct antonym of the word itself.

来週、新しい登山ルートを試してみようと思っています。 ・Translation: I am thinking of trying out a new mountain climbing route next week. ・Explanation: This sentence describes the intention to try a new route for mountain climbing.

彼は登山の経験が豊富で、危険な場所もよく知っています。 ・Translation: He has a lot of experience in mountain climbing and knows dangerous places well. ・Explanation: This sentence describes someone's experience with 登山.

The word 登山 is formed from two kanji: 登（to） and 山（zan）. 登 means to "ascend" or "climb," and 山 refers to "mountain." Therefore, the combination of these two characters directly represents the act of climbing a mountain.