Understand the breath of the tides to better embrace every coastline
The ocean's rhythm composed by lunar gravity
Tides are primarily caused by the gravitational forces of the Moon and Sun on Earth's oceans. Although the Moon's mass is far less than the Sun's, its proximity to Earth gives it roughly twice the tidal influence. When lunar gravity pulls on ocean water, the side facing the Moon bulges outward creating a high tide, while the opposite side also rises due to centrifugal force — which is why most locations experience two tides per day.
Around the new moon and full moon, the Sun, Moon, and Earth align nearly in a straight line, and their gravitational forces combine to produce "spring tides" with the greatest tidal range. During the first and third quarter moons, the solar and lunar gravitational forces act at right angles, partially canceling each other out to produce "neap tides" with the smallest range. The intertidal zone is most exposed during spring tides, making them the best time for tide-pooling and photography.
Most of China's coastal areas experience "semidiurnal tides" — two high tides and two low tides per day, with a cycle of approximately 12 hours and 25 minutes. Parts of the South China Sea, such as the Beibu Gulf, have "diurnal tides" with only one high and one low tide per day. Understanding the tidal pattern at your destination is essential for planning coastal trips.
The intertidal zone is the area between the high tide and low tide marks — the ecological transition zone where ocean meets land. When the tide recedes, the exposed mudflats and rocks harbor starfish, sea anemones, barnacles, crabs, and other rich marine life, creating a natural window for observing coastal ecology. The width of the intertidal zone depends on tidal range and topography, and can extend several kilometers on gently sloping shores.
Always check tide predictions before heading out. We recommend using the China Marine Forecast website or apps like "Global Tides." Tide charts display daily high and low tide times along with tidal height data. For photography and tide-pooling, arrive about two hours before the lowest tide during a spring tide period — this way you can watch the intertidal zone gradually reveal itself as the water recedes.
The first through third and fifteenth through eighteenth days of the lunar month are spring tide periods, ideal for tide watching and tide-pooling. Famous tide-watching spots in China include: the Qiantang River Tidal Bore (Haining, Zhejiang — most spectacular on the 18th day of the 8th lunar month), Xiapu mudflats (most beautiful textures at ebb tide), Weizhou Island volcanic coast (intertidal life at low tide), and Dongshan Island (tides and the Wind-Moved Stone). Tide times vary by location, so check in advance.
Safety, gear, and clothing — make every coastal journey comfortable and worry-free
Converse with the tides through your lens — freeze the coast's most moving moments
The hour after sunrise and before sunset is the "golden hour" — soft, warm light ideal for coastal panoramas and tidal landscapes. The 30 minutes before sunrise and after sunset is the "blue hour," when the sky transitions through deep blue to purple gradients, perfect for silhouettes and long-exposure seascapes. These two windows are the "prime time" every coastal photographer fights for.
Using ND filters (ND64 or ND1000 recommended), slow your shutter speed to 2-30 seconds to transform crashing waves into silky-smooth textures. For rock pools between reefs, 1-4 second exposures create mirror-like reflections on the water surface. A sturdy tripod is essential for long exposures — choose one with good wind resistance.
The biggest mistake in coastal photography is "just sea and sky." Using intertidal rocks, shells, seaweed, or sand patterns as foreground elements dramatically enhances depth and storytelling. Low-angle shooting is key — get your camera close to the ground to magnify foreground elements, creating strong spatial contrast with the distant horizon.
The intertidal zone after ebb tide is a treasure trove for macro photography. Textures on seashells, barnacle colonies on rocks, tiny sand balls excavated by crabs, water droplets on seaweed — these details often move viewers more than grand landscapes. Use a macro lens or your phone's macro mode, and take the time to crouch down and observe — you'll discover an entirely new world.