(particle equivalent to 啊 after noun ending in -n)
sentence-final particle (abbr. for 呢啊[ne5 a5] or variant of 哪[na5])
(adverbial expression indicating that the attention of the subject of the verb is focused on what they are doing, not distracted by anything else)
just ...ing (and nothing else)
Tiger's leap falls on the Jinsha River 金沙江[Jīn shā jiāng] in Lijiang Naxi autonomous county 麗江納西族自治縣|丽江纳西族自治县[Lì jiāng Nà xī zú zì zhì xiàn], Yunnan
Sana'a, capital of Yemen (Tw)
For goodness sake!