Sri Lanka, an island nation in South Asia, is known for its beautiful beaches that offer diverse landscapes and activities. Here are some popular beaches around Sri Lanka:

1. Unawatuna: Located near Galle, Unawatuna is a picturesque crescent-shaped beach known for its clear waters and coral reefs. It's a great spot for snorkeling and diving.

2. Mirissa: Mirissa is a laid-back beach destination known for its golden sands and calm waters. It's a popular place for whale watching, and you can find vibrant beachside restaurants.

3. Bentota: This beach is located in close proximity to Colombo and is famous for water sports activities like jet-skiing, windsurfing, and parasailing. The Bentota River nearby also offers boat safaris.

4. Arugam Bay: On the east coast of Sri Lanka, Arugam Bay is a renowned surfing destination. It has a relaxed vibe and attracts surfers from around the world, especially during the surfing season (April-October).

5. Negombo: Close to the Bandaranaike International Airport, Negombo is known for its long sandy beaches and vibrant local culture. It's a convenient stop for those arriving or departing from the airport.

6. Hikkaduwa: This beach town is popular for its coral sanctuary, making it a great place for snorkeling and diving. It's also known for its lively nightlife and beachfront bars.

7. Pasikudah: Located on the east coast, Pasikudah is famous for its shallow and calm waters. It's an ideal spot for swimming and water sports, and the surrounding area has a serene atmosphere.

8. Tangalle: Tangalle boasts pristine and less-crowded beaches. It's a perfect place for those seeking a more secluded and tranquil coastal experience.

9. Kalpitiya: Known for its scenic beauty, Kalpitiya is a beach destination on the west coast. It's famous for kite surfing, dolphin watching, and seasonal whale watching.

10. Trincomalee: On the northeast coast, Trincomalee has beautiful beaches like Uppuveli and Nilaveli. These beaches are known for their soft white sand and crystal-clear waters. Pigeon Island, offshore from Nilaveli, is a popular snorkeling spot.