Pools of crystal blue water, glistening waterfalls and rapid-frothed rivers are among the stunning wild-swimming spots around the world, highlighted in a new book.
The best-selling Wild Swimming series has released its latest edition, which focuses on Croatia and Slovenia.
The book highlights more than 120 of the most beautiful places to swim in the two countries, from the Mediterranean coastline of Croatia to the mesmerising waterfalls and mountain rivers of Slovenia.
The release of the aspirational guide comes as demand for trips to the two southern European countries continues to rise.
Tourists looking for a slightly cheaper trip away off the well beaten tracks have found that the two nations and their areas of stunning natural beauty have a lot to offer.
The book's publisher's promise to reveal "secret coves, sea caves, rock arches, waterfall pools, aquamarine canyons and hidden lakes", as well as practical information about where to find them and how they can best be reached.
It comes from the mind of Hansjörg Ransmayr, a lifeguard, competition swimmer, mountain guide, white water canoeist and creative director.
We take a look at some of the most enchanting ones...
Lake Bohinj, municipality of Bohinj, Slovenia
This 'enchanting alpine lake' has one shore which is populated by restaurants and tourist facilities, and one which is remote and picturesque.
While less famous than Lake Bled, the way in which sheer cliffs hang over the green-blue water ensure it's a place wild-swimmers want to keep on visiting.
"The crystal-clear water of the lake, which is completely renewed by confluence about three times a year, is a paradise not just for swimming and those who like watersports but also the great variety of fish species that thrive here," Hansjörg writes.
Lake Bled, Upper Carniola, Slovenia
This is probably Slovenia's most famous tourist attraction, and with good reason.
The relatively short lake attracts huge numbers of visitors each year who plunge into its warm, clear waters.
In the middle of the lake is an island which houses a church and artefacts from the Middle Ages.
Lake Bled may not be ideal for wild swimmers who want a bit of peace and quiet, due to the large number of restaurants and bars along its edges.
"Apart from offering wonderful views of the lake, island and castle, there is a big sunbathing lawn, mobile loos, SUP board rental and nearby bars and restaurants," the author writes.
Kokra Valley, municipality of Preddvor, Slovenia
What often takes the first-time visitor to Slovenia back is how verdant its forests are, as well as the remarkable colour of its waterways.
The Kokra Valley has both of these qualities in abundance, as well as easily accessible and safe bathing pools.
Korana City Beach, Karlovac, Croatia
Karlovac city lies on four rivers, all of which have very good water quality.
In the summer the warmth of the country and the way the rivers run allows their water to reach swimming pool like temperatures.
"In warm summers, the Korana at Karlovac can reach bathing temperatures of up to 28C," Hansjörg writes. "The park-like environment along the river banks includes many sunbathing lawns, sports grounds and restaurants."
Olib, Croatia
If you love wild swimming and hate cars, then this island is for you.
Olib is a "car-free island paradise" which is home to about 150 people and plenty of waterside coves.
The best spots on the island can only be reached by boat or a lengthy walk, making it the perfect spot for the more committed swimmer who craves a wilder experience.
The book can be purchased in high street bookshops and online here.