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5-acre lake near Ceredigion. The lake tops out around 23 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. Species by species, here's what the data says the year looks like.
The outline encloses 5 acres, worked by 0.4 miles of shoreline. Nearly circular (index 1.4), so the story is the bottom, not the bank. The shallow band under 15 ft claims about 64% of the surface on the model — that's where the groceries are. Ceredigion claims this one. Its nearest charted neighbour, Llyn Fyrddon Fawr, is 3 mi to the south.
Start shallow in spring: brown trout sit in 3 to 23 ft that time of year. They don't go far with the seasons — 7 to 23 ft covers summer, 3 to 23 ft covers winter. The spot to know is Break off the point, a drop-off in about 10 ft of water that rates prime for brown trout in summer. Warm-month bites cluster around after dark and early morning. Throw a spoon at the thermocline or a deep stickbait (night) until the fish tell you otherwise.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 23 ft chart-limited; documented 3 to 25 ft | dawn & dusk | Main-lake point (8 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 7 to 23 ft chart-limited; documented 25 to 60 ft | night & dawn | Break off the point (10 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 4 to 23 ft chart-limited; documented 5 to 30 ft | dusk & dawn | Main-lake point (8 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 3 to 23 ft chart-limited; documented 5 to 35 ft | dawn | Break off the point (10 ft) | Jigging spoon, Small stickbait (slow) |
When the water first warms, european perch slide up into 3 to 12 ft. By summer they slide out to 7 to 23 ft, and by winter most fish are in 7 to 23 ft. If you only fish one area, make it Deep basin: a deep basin around 20 ft that scores prime in fall. In summer the feeding windows fall in early morning. Keep a drop-shot micro plastics or a small crankbait (perch pattern) rigged through the warm months.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Break off the point (10 ft) | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 7 to 23 ft chart-limited; documented 8 to 28 ft | dawn | Deep basin (20 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 7 to 23 ft chart-limited; documented 10 to 33 ft | midday | Deep basin (20 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 7 to 23 ft chart-limited; documented 12 to 33 ft | midday & dawn | Deep basin (20 ft) | Tungsten jig + maggots, Small balance jig |
Spring northern pike on Llyn Isaf hold shallow, usually 2 to 8 ft. By summer they slide out to 8 to 20 ft, and by winter most fish are in 5 to 15 ft. The chart's best answer is Break off the point — drop-off, 10 ft, prime for fall. Prime time lands in early morning and the evening. The summer box starts with a bucktail or a weedless spoon over cabbage.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | open water | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (10 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Break off the point (10 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Main-lake point (8 ft) | Tip-ups, Large jigging spoon |
Structure-wise the chart holds 3 features, led in depth by Deep basin at roughly 20 ft.
Llyn Isaf is about 23 ft (7 m) deep at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
Anglers target brown trout, european perch, northern pike on Llyn Isaf. This isn't a survey of the water — none is published for it — but an informed estimate from the species common to the region, narrowed by this water's depth, size and each species' range.
Deep basin is the top-rated area: a deep basin in about 20 ft of water that rates prime for european perch in fall. Every other rated spot, per species and season, is on the map above.
For brown trout, the summer bite is best in after dark and early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Llyn Fyrddon Fawr 3 mi · Llynnoedd Ieuan 4 mi · Llyn Cerrigllwydion Isaf 4 mi · Llyn Hîr 5 mi · Llyn Teifi 5 mi · Llyn Egnant 5 mi · Llyn Gynon 7 mi · Bugeilyn 10 mi · Llyn Clywedog 10 mi · Maes-Llyn 11 mi · Llyn Cwm-byr 11 mi · Llyn Penrhaeadr 11 mi
See how Llyn Isaf stacks up: best northern pike lakes in United Kingdom · best european perch lakes in United Kingdom · best brown trout lakes in United Kingdom
More water nearby: Ceredigion fishing maps (11 charts). Browse all United Kingdom fishing maps. See every water on DepthScout. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.