By Lucy Craymer and Lewis Jackson WELLINGTON (Reuters) -Tens of thousands of New Zealanders rallied before parliament on Tuesday in one of the country's largest ever protests to oppose a bill that opponents say seeks to dilute the rights of Maori and threatens to set race relations back decades.

Nine-day march across New Zealand culminates in Wellington as huge numbers gather to protest bill that opponents say seeks to dilute Māori rights.   00:58 David Seymour, whose minor libertarian Act party introduced the bill that the hīkoi is protesting,

A proposed bill would revise the country's foundational treaty with Maori people and is hugely unpopular. Here's what to know.