The sand boils

## Overview The Sand Boils is a remarkable natural spring site located near the headwaters of the River Hamble in Hampshire, England. Here, clear chalk-filtered water wells up through the streambed, creating mesmerising swirling sandy patches — the "sand boils" that give this spot its evocative name. The upwelling spring water feeds the Western Stream, which, together with the Eastern Stream arising from Alexanders Moors, flows into Waltham Mill Pond before merging with The Moors Stream to form the River Hamble. The geology behind the Sand Boils is characteristic of Hampshire's chalk downlands. Rainwater percolates through layers of porous chalk over many years, becoming naturally filtered and mineral-rich before emerging under pressure at the surface. This artesian-like process forces water and fine sand upward through the streambed, producing the distinctive boiling effect visible in the clear, shallow water. Chalk springs like these are prized for their consistent temperature and exceptional clarity, and they have historically been valued as sources of clean water across southern England. The River Hamble, which begins its journey here, is one of Hampshire's best-known waterways, flowing south for roughly 13 miles before emptying into Southampton Water. Visiting the Sand Boils offers a rare chance to see the very birthplace of this storied river. ## Directions The Sand Boils are situated near Bishop's Waltham in Hampshire, England. The approximate GPS coordinates are **50.950713, −1.206492**. 1. Head to the area around Bishop's Waltham, Hampshire. 2. Look for footpaths or public rights of way that follow the Western Stream upstream from Waltham Mill Pond. 3. The Sand Boils can be found along the Western Stream where the spring water visibly upwells through the sandy streambed. *Note: Exact access routes may vary seasonally. Ordnance Survey Explorer Map 119 (Meon Valley) covers this area in detail and is recommended for walkers seeking the precise location.* ## What to Expect At the Sand Boils, visitors will find a gentle, shallow stream with patches of sand that appear to "boil" as spring water pushes up from below. The water is typically crystal clear — a hallmark of chalk-fed springs — and the effect is most easily observed on calm days when the surface is undisturbed. The surrounding landscape is lush Hampshire countryside, with meadows and waterside vegetation framing the stream. The site is best appreciated on foot, and the terrain is generally flat and accessible, though paths near the stream may be muddy after rain. The spring flow tends to be fairly consistent year-round, as chalk aquifers release water steadily, but the visual effect of the sand boils may be more or less pronounced depending on recent rainfall and groundwater levels. This is a peaceful, lesser-known spot — ideal for nature lovers, walkers, and anyone curious about the hidden origins of England's rivers. The chalk-filtered water has historically been regarded as exceptionally pure, though as with any natural water source, its quality cannot be guaranteed for drinking without testing.