Kogin Boulder
General information
Tsawo	12.2 km
Labarin ƙasa
Tsarin Daidaiton Labarin Kasa	40°48′09″S 172°32′56″E / 40.80244°S 172.54875°E / -40.80244; 172.54875
Kasa	Sabuwar Zelandiya
Territory	Tasman District (en)
River mouth (en)	Kogin Aorere

Kogin Boulder ƙaramin kogi ne a arewacin Tsibirin Kudancin Wanda yake yankin New Zealand .

Kan Ruwan yana a ƙaramin tafkin Boulder na Kahurangi National Park . Kogin yana gudana arewa har tsawon 10 kilometres (6 mi) kafin shiga cikin kogin Aorere.

40°48′S 172°33′E / 40.800°S 172.550°E / -40.800; 172.550