Pimachiowin Aki (/ˌpɪˈmætʃəwɪn ɑːˈkiː/ pih-MATCH-uh-win ah-KEE) is a UNESCO World Heritage Site located in the boreal forest that covers parts of Manitoba and Ontario.

The World Heritage Site's original proposal started with the signing of the Protected Areas and First Nation Resource Stewardship Accord in 2002.

Just days before his retirement from office, Premier Gary Doer announced that the government would donate $10 million to a trust fund for a UNESCO World Heritage site on the east side of Lake Winnipeg.

[6] The NDP proposed a longer, more expensive, alternate line through the west of Manitoba to preserve the environmental integrity of the east side and to support the UNESCO site.

In 2016, following modification to the bid, focusing it on the Ojibwe cultural tradition of Ji-ganawendamang Gidakiiminaan (keeping the land), the committee was set to inscribe the property on the list.