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Cwm is a ribbon-plan colliery village in the main Ebbw valley between Ebbw Vale and Aberbeeg, sitting in one of the narrower reaches of the valley where the river bends between steep sycamore-wooded slopes. The village retains a distinct character from its surrounding townships: a single main street along the valley floor with the river on one side and tight terraced rows climbing the hillside on the other. The valley sides above Cwm are clothed in sycamore and planted conifers transitioning to open heathland at the rim; bramble and rosebay willowherb dominate the reclaimed spoil tips on both sides of the valley above the housing. The hawthorn hedgerows on the sheep pastures above 300 metres provide a classic April supplement before the main valley flow begins.

Sycamore is the dominant May flow tree throughout the borough, flowering profusely on the valley sides from Blaina to Brynmawr. Hawthorn on the valley-rim hedgerows and blackthorn in the gorse-edge scrub supplements the April flow. Bramble is exceptionally dense on the extensive reclaimed colliery tip and forestry margins — a prolonged and reliable mid-summer crop — and rosebay willowherb adds colour and forage on every disturbed bank. White clover covers the playing fields and recreation grounds of the valley-floor settlements; the Clydach Gorge ash woods below Brynmawr add a limestone-flora element unusual in the valleys. Ling heather and bilberry on the plateau above 350 metres at Beaufort, Brynmawr and Tredegar give accessible late-summer heather forage rarely available this close to a valley settlement. A strong ivy flow on old stone terraces and chapel walls closes the year in October.