Vivian Palomequi walked for a month and more than 900 kilometers from her home in the Bolivian Amazon to the capital, La Paz.
She arrived in late April to protest a law she fears will accelerate deforestation and land privatization.
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"We declared a state of emergency and started marching," said Palomequi, a leader of the Peasant Farmers' Union.
"We had no other choice."
The march is part of a broader backlash against the environmental policies of President Rodrigo Paz's administration.
Since taking office in November, Paz has staffed ministries with former agroindustry leaders, opened protected areas to mining, and criminalized environmental defenders.
Mass Indigenous and peasant mobilizations are not new in Bolivia.
In the 1990s and early 2000s, large marches followed similar routes from the Amazonian lowlands to La Paz.
Resistance to extractive projects continued under previous leftist governments, including that of Evo Morales, Bolivia's first Indigenous president.
While those administrations championed pro-environmental rhetoric, they faced criticism for pursuing ecologically destructive policies. That pattern of state-backed environmental destruction meeting fierce resistance persists under the new government.
President Paz ran as a centrist with few environmental proposals beyond a domestic carbon market plan.
Eight months into his term, activists and analysts argue his policies have continued or worsened the extractive agendas of previous administrations.
"It's the same old policy," said Ruth Alipaz, an Indigenous leader from the Amazon north of La Paz.
"When a crisis hits, the response is to ramp up resource extraction – and that takes place right inside our territories and protected areas."
