Humpback Whale watching tour Mafia. You can see humpback whales migrate every year between the warmer waters of the Indian Ocean and the cooler feeding grounds closer to South Africa. This can be seen near the Mafia group. Take a native dhow to see these huge fish. If you’re lucky, you can see the whales breach, which means they jump out of the water, and land with a huge splash. The boat is then carefully placed, and the engine is turned off. A wonderful experience!