Long Seniai (also known as Long Sinei) is a longhouse settlement in the Marudi division of Sarawak, Malaysia. It lies approximately east-north-east of the state capital Kuching.

Neighbouring settlements include: Long Merigong east Long Tebangan southwest Long Tap southwest Long Akah southwest Long Datih east Long San southwest Long Daloh northwest Long Lellang east Long Selatong southwest Aro Kangan east

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