Grænavatn, aka the "Greenlake," is a hidden gem located in Reykjanes Peninsula, Iceland. This volcanic crater lake gets its name from its vibrant green color caused by a high level of sulfur in the water. It's like stepping into a fairytale! The lake is relatively small but packs a punch with its mystical aura. Take a leisurely stroll around the lake and soak up the breathtaking scenery in just 20 minutes. Keep an eye out for the colorful changing hues as you reach the deeper spots. It's a geological wonder that will leave you awe-struck!