In the case of the Río Tinto River in Spain, you'd probably be right. When you see a river tinged red, like blood, the last thing you'd probably want to do is swim in it. Many divers have died trying to explore it, and others have died merely trying to bring their remains back to the surface. It's not quite so simple either, as the watering hole is filled with silted chambers and passageways. The main cavern is approximately 4,341 feet (1,323 meters) deep, which means it would require a substantial amount of oxygen supply if you wanted to make it to the bottom. The real danger of Jacob's Well lies in its attraction to divers. If you just want to swim and have the skills to stay afloat, you're probably fine. Just by looking at it, you'd never know it has claimed the lives of at least 8 or 9 people over the past couple of years. Jacob's Well is a beautiful and alluring swimming hole located northwest of Wimberley, Texas (about a 45-minute drive from Austin). This may be one of the most unassuming inclusions. Plus, it's literally called 'Frying Pan Lake,' so there's that. The eruption that created the crater-known as the Mount Tarawera eruption-killed over 100 people in 1886, so it has a pretty grim history as far as humans are concerned. you probably still wouldn't want to dive in: The Lake emits hydrogen sulfide and carbon dioxide. The lake itself is ordinarily just 18 feet (5.5 meters) deep but can go down as far as 60 feet (18 meters) at vents.Įven if it weren't so hot. The lake itself covers more than 400,000 square feet (38,000 square meters). However, Frying Pan Lake is the largest, and is located in a portion of a volcanic crater known as Echo Crater. So hot in fact, it remains heated to temperatures around 113 to 131 degrees Fahrenheit (45 to 55 degrees C), so it's not exactly the most welcoming hot springs in the world. Frying Pan Lake in Waimangu Volcanic Valley Source: Pseudopanax/Wikimedia

I mean, with a name like that, who in their right mind would think, 'man, this seems like a good place to go for a relaxing swim?' Located in New Zealand ’s Waimangu Volcanic Rift Valley, as you might have guessed, this lake gets pretty hot.

Lago natron rio