1: 1. Lake Baikal, Russia: World's deepest and oldest lake. 2. Crater Lake, USA: Stunning blue waters in volcanic caldera. 3. Lake Titicaca, Bolivia/Peru: Highest navigable lake in the world.

2: 4. Plitvice Lakes, Croatia: Stunning cascading waterfalls and crystal-clear lakes. 5. Lake Como, Italy: Glamorous destination surrounded by lush mountains. 6. Loch Ness, Scotland: Home to the legendary Loch Ness Monster.

3: 7. Lake Bled, Slovenia: Iconic island with a picturesque church in the middle. 8. Lake Tahoe, USA: Surrounded by snow-capped mountains and pine forests. 9. Great Barrier Reef, Australia: World's largest coral reef system and marine park.

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