VILLA TUNARI, Bolivia — The road to Evo Morales’s political stronghold, in the heart of Bolivia’s coca farming region, is nearly impassable these days.

First, tires and wooden crates block the way, forcing travelers to stop and negotiate with supporters of Mr. Morales, the ousted Bolivian president, who have cut off access to the region. Farther ahead, the road is obstructed by tree trunks and barbed wire, and then by towering mounds of stones and earth.

At each of the nearly 100 barricades along the way, suspicious guards — sometimes several hundred of them — wield sticks and nail boards, turning away anyone without a permit or medical emergency.

Finally, after traveling 100 miles through the seemingly endless debris, the tropical town of Villa Tunari emerges in a lush river valley in the Andean foothills. This is where Mr. Morales, the country’s first Indigenous president, started and ended his political career — and where he is still treated with almost superhuman reverence.