Lago Strobel earned the name Jurassic Lake for rainbow trout that grow to a scale most anglers never see anywhere else — fish in double figures aren't the exception here, they're the expectation, built on a limestone lake bed thick with scuds that these trout gorge on year-round. The water sits exposed on windswept steppe, cold, alkaline and startlingly clear, with rainbows patrolling the margins and drop-offs where a Scud, Leech or Woolly Bugger stripped with intent will draw takes that hit like a freight train. Wind is a constant companion and a serious safety consideration on open water. This is genuinely expedition fishing — remote, logistically demanding and typically arranged through a specialist operator rather than attempted independently — but for anglers chasing the biggest rainbow of their life, there may be no better water on earth.

• Lake
• Limestone