The name comes from the Serra Rochedo, a range of hills that feeds dozens of pure, crystalline springs within the park. Those springs matter: they sustain the headwaters of a regional river system that eventually joins the Teles Pires, which bounds the park's southwest corner. The park sits in the municipality of Novo Mundo, adjoining the Cristalino State Park to the west and the state of Pará to the east. Together, the two Cristalino parks form a contiguous block of 184,900 hectares of protected forest. The vegetation is a transitional mosaic - savanna flowing into seasonal forest, seasonal forest into pure Amazonian rainforest. The climate is typical tropical continental, best visited between May and October, the dry season when the skies clear and the wildlife becomes easier to see.

The trouble began almost immediately. In early 2002, Mato Grosso governor Dante de Oliveira - a once-celebrated democrat who had led the movement for direct elections in the 1980s - sent two messages to the state legislature proposing to shrink the combined parks by 72,400 hectares, a full 42 percent of their protected area. The justification was that much of the land had already been cleared for pasture anyway. A federal judge disagreed. In December 2002, the court ruled that the state's land sales had been improper, transferred ownership to the federal land reform agency INCRA, and placed administrative responsibility with IBAMA. Attempts to destroy the bridges on the Nhandú River, used to haul illegally cut timber, followed. By 2003 the enforcement effort had faltered. The squatters stayed. The trees kept falling.

What protection has persisted is worth defending fiercely. Cristalino II holds one of the richest bird concentrations in the Amazon: 850 species recorded, 50 of them endemic. That is nearly eight percent of all bird species on Earth, packed into a single state park in Mato Grosso. Forty-three species of reptile, 29 amphibians, 36 mammals, and 16 fish round out the surveyed fauna. Birdwatchers from around the world have long considered the region a premier destination, drawn especially to the lodges on the neighboring Cristalino State Park where harpy eagles and cotingas are known to appear. The park's savanna-to-rainforest gradient creates overlapping habitats that produce this density - and that same gradient is what loggers want.

The legal history reads like a parliamentary thriller. In 2006, Mato Grosso state deputies passed law 8.616, shrinking the park. The governor vetoed it under pressure from environmental groups. The deputies overrode the veto. A judicial order on 26 January 2007 suspended the law. A consultative council was created in November of that year. A management plan followed in 2009, a revision in 2014. Meanwhile the farms, the settlements, the logging operations continued operating inside the park's nominal boundaries. INCRA at one point planned to settle some 5,000 landless families in the Novo Mundo municipality - an influx that would have added roughly 20,000 people to an existing population of 3,590, a demographic transformation with obvious implications for any adjacent protected area. On 17 October 2014, SEMA, the state environmental agency, called on landowners and squatters inside the park to submit claims for possible regularization. The invasions had, in effect, been legalized.

Flying over Cristalino II today, you see the cost written on the forest. The pristine core still holds - the Serra Rochedo, the springs, the canopy denser than anything to its north. Around it, the edges have been frayed by roads and small cleared plots, not yet pasture in some cases but visibly modified. The Teles Pires glints in the southwest, a broad river of the Amazon system still clean enough to run ecotourism lodges. For every hectare lost, decisions made in distant state assemblies have played as large a role as any chainsaw. Whether the 850 bird species that nest here will still have a home in fifty years depends less on biology than on law - on whether courts, ministers, and deputies can hold a line that has been challenged almost continuously since the first decree.