Chi River
 The Chi River (Thai: แม่น้ำชี RTGS: Maenam Chi IPA: [mɛ̂ːnáːm tɕʰīː]) is the longest river in Thailand; it extends 765 km but carries less water than the second longest river the Mun. In the Isan language of this region as well as in the adjacent Lao language the name of the river is pronounced and in the romanization of Lao transliterated as Mae Si ([sīː]) while the transliteration Chi reflects Bangkok-Thai.