A lake in Zhangjiajie Nature Reserve, Hunan Province, central China. /CFP

A flock of starlings in Romsey, UK, at sunset. Photographer Natasha Weyers said, "They were there for around 20 minutes, often splitting off into two groups, then reforming as one. Many locals came to get a dose of nature – socially distanced of course! I hope people love the image, especially those who are shielding or not able to get out through the lockdown." /CFP

Two mute swans at the Slimbridge Wetland Center in Slimbridge, UK. The male and female birds of this romantic species, the cob and pen, usually mate for life. /CFP

Two birds paint a picture of romance as they gaze at each other on a lake illuminated by a pretty sunset. The photographer said the pair of great crested grebes were courting and created symmetrical poses together as they took a moment to pause on the water. Moments later, the birds came together in a sweet embrace, both paddling furiously to maintain an upright position. Photographer Roberto Marchegiani took the romantic picture on Lake Garda near Verona, Italy. /CFP

A coral reef at Hardy Reef, near Whitsunday Islands, Australia. /CFP

Fish and dolphins put on a romantic underwater display just in time for Valentine's Day. However, the cute image has a sinister twist as the pod of dolphins rounded up the heart-shaped school for a tasty fish dinner. The shot was captured by Christopher Swann in Azores, Portugal. /CFP

Seals lie on a small iceberg after hunting for prey. Photographer Alex Bred captured the relaxing seals near the Antarctic Peninsula. /CFP

It seems an unlikely place to find such a symbol of romance. But Mother Nature chose this bleakly beautiful Arctic landscape to leave her mark in the form of a stunning heart-shaped lake. It has emerged as climate change melted the glacier that covered the area. Blocks of ice trapped during the glacier's retreat caused the ground to cave in, creating such a hollow, that then filled with rainwater or snow melt. The picture was taken by French photographer Bruno Mazodier on Spitsbergen, the largest island in the Svalbard archipelago. /CFP

A "heart" appears during the continuing lava flow of the Kilauea volcano. Look carefully and you will see the heart is held in a hand, with the thumb just above the heart on the right side. Photographers Don Hurzeler, 71, and C.J. Kale, 42, share their island home in Kailua-Kona, Hawaii, with several active volcanoes. /CFP

A tropical scene of glassy water and barreling waves more typical of Hawaii, but actually shot in Cornwall, UK. Surf-photographer and artist Mike Lacey, 28, usually swims out in terrifying seas and crouches on shorelines to get breathtaking images of waves. /CFP