Compare Middle Chinese 澳 (MC 'awH|'juwk, “inlet, bay”), Khmer អាវ (ʼaaw), Burmese အော် (au), Mon ဩ. Cognate with Lao ອ່າວ (ʼāo).
| Orthographic/Phonemic | อ่าว ɒ ˋ ā w | |
| Romanization | Paiboon | àao |
| Royal Institute | ao | |
| (standard) IPA(key) | /ʔaːw˨˩/(R) | |
อ่าว • (àao)