When it comes to encountering whales in the wild, most of us are content to glimpse them through binoculars on a whale-spotting cruise or from a vantage point onshore.

But more adventurous nature lovers are heading for the South Pacific kingdom of Tonga, where you can actually swim with some of the world's largest mammals.

Whaleswim Adventures runs six-, seven- and nine-day tours that give enthusiasts a chance to swim with humpback whales off the island of Vaka'eitu, near Vava'u

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nginx/1.14.0 (Ubuntu) in northern Tonga. To minimize environmental impact, each tour has a limit of...