The Ulakhan-Botuobuya (Russian: Улахан-Ботуобуя or Большая Ботуобуя; "Big Botuobuya"; Yakut: Улахан Ботуобуйа, Ulaxan Botuobuya) is a river in Yakutia (Sakha Republic), Russia.

There is a pontoon bridge of the A331 highway stretch between Mirny and Udachny crossing the river just before its confluence with the Vilyuy.

[2] The Ulakhan-Botuobuya begins in the Lena Plateau at an elevation of 317 metres (1,040 ft).

It flows first roughly eastwards and then northeastwards across the Vilyuy Plateau within a wide valley.

[3] The largest tributary of the Ulakhan-Botuobuya is the 58 kilometres (36 mi) long Tas-Yuryakh (Таас-Юрэх) that joins it from the right.