Ivalojoki (Northern Sami: Avviljohka, Inari Sami: Avveeljuuhâ) is a 180-kilometre-long (110 mi) river in Finland that flows through upper Lapland into Lake Inari.
Ivalojoki starts from the Korsatunturi hugging the border between the communities of Inari and Enontekiö, where two side streams are meeting. The first streams branching off of it can be found on the bogs of Peltotunturi on the border between Finland and Norway along the western border of the Lemmenjoki National Park. The river flows into Lake Inari from a 5-kilometre-long (3 mi) delta approximately 10 kilometres (6.2 mi) from the village of the same name, which is located on both banks of this meandering, shallow run. The Repo, Tolos, Sota and Kylä Rivers, the latter two of which are renowned for the gold found in them, are some of Ivalojoki's tributaries.
For almost its entire length, Ivalojoki flows through wilderness. Near its headwaters, the river meanders as a narrow stream through the southernmost bogs of the Lemmenjoki National Park. Halfway down its length, the national park becomes the Hammastunturi Wilderness Area, through which it flows almost all the way to Ivalo.

Quelle: Wikipedia