Experience a burst of activity or just some scenic calm with these city-based trips, featuring a kayaking tour of Tyne bridges to yoga on a paddleboard.
Ahead of the BBC’s new David Attenborough series Planet Blue II, we pick 10 trips that explore the oceans, from diving the Pacific’s ‘underwater Serengeti’ to reef conservation in Belize and kayaking in Komodo
The Outdoor Swimming Society’s Kari Furre kicks off a series of guided swims with experts, taking Jenny Landreth to one of her favourite spots near Totnes
As 80% of the world’s wastewater flows untreated into the environment, an expert panel discusses how to promote water reuse.
From Windermere to the Antarctic peninsula, here are the pick of Guardian readers’ shots on the theme of water.
A huge primitive ocean covered one-fifth of the red planet’s surface, making it warm, wet and ideal for alien life to gain a foothold, scientists say