Writing in the World of Avatar

In Mandarin, each character is one syllable. For example, Yue's name is pronounced Yuè, rather than "yoo-eh."

People
Name - Hanzi/Kanji - Mandarin Pronunciation （in Hanyu Pinyin) - English translation

Aang: 安昂 - ān áng - Peaceful Soaring

Bumi: 布米 - bù mǐ - the name is probably phonetic, since the individual parts mean "declare/announce" and "rice"

Chey: 澈- chè - clear (as in water); thorough

Jeong Jeong: 琤琤 - chēng chēng - the sound of the tinkling of gems

Yue: 月 - yuè - Moon

Place Names
Location: Hanzi/Kanji - Mandarin Pronunciation （in Hanyu Pinyin) - English translation.

Ba Sing Se: 永固城 - yǒng gù chéng - Eternally Solid City

Chameleon Bay: 變色龍灣 - biàn sè lóng wān - Chameleon Bay

Crescent Island: 新月岛 - xīn yuè dǎo - New Moon Island

Fire Nation: 火國 - huǒ guó - Fire Nation

Full Moon Bay: 滿月灣 - mǎn yuè wān - Full Moon Bay

Jasmine Dragon: 茉莉龍 - mò lì lóng - Jasmine Dragon

Nan Shan River: 南山川 - nán shān chuān - Southern Mountain River

Omashu: 奥瑪舒城 - ào mǎ shū chéng - transliteration of word "Omashu"

Pao Family Tea House: 包氏茶館 - bāo shì chá guǎn - Bao Clan Teahouse

Senlin Village: 森林村 - sēn lín cun - Forest Village, or Village in a Forest

Serpent's Pass: 盤蛇關 - pán shé guān - Coiled Snake Pass

Si Wong Desert: 死亡沙漠 - sǐ wáng sha muo - (No exact translation) Death Desert, Desert of Death

Wan Shi Tong's Library: 萬知堂神祕圖書館 - wàn zhī táng shén mì tú shū guǎn - Wan Zhitang Mysterious Library ("Wan Zhitang" further translates to "10,000 Knowledge Hall")

Whale Tail Island: 境遇尾巴岛 - jīng yu wei ba dǎo - Whale Tail Island