Why Boa Vista (Cape Verde) Has Massive Waves

Boa Vista's north/east coasts (especially Santa Mónica Beach) receive world-class swells due to a perfect storm of factors:

1. Unobstructed Atlantic Fetch: 3,000+ km of open ocean from North Atlantic storms → massive energy accumulation.
2. Trade Winds (NE): Consistent 15–25 knots year-round generate persistent wind swell + groom groundswell.
3. Bathymetry: Deep water approaches shore rapidly; underwater canyons/ridges focus and amplify wave energy (refraction).
4. Coastal Geometry: Headlands and points (e.g., Ponta do Sol) refract waves into peaks; long sandy bays allow orderly lines.
5. Seasonality: Best swells Oct–Apr (N. Atlantic winter storms); summer = smaller wind swell.

Waves can exceed 15–20 ft (5–6 m) faces—not the "100 ft" sometimes claimed (that's Nazaré, Portugal). Still, powerful, hollow, and dangerous. Attracts pro surfers; not for beginners.