137 independent boarding schools in the South East region, verified from the UK Government Get Information About Schools (GIAS) register.
The South East is the heartland of British boarding — Eton, Harrow (historically), Winchester, Brighton, Tonbridge and a dozen others. Commuter belt towns, fast rail into London, and the densest concentration of full-boarding heritage schools in the country.
Quick comparison of the leading boarding schools in South East. Open any school page for the full academic and pastoral breakdown.
Sibling regions worth comparing — many families consider two or three regions before committing, especially when travel from London or an international airport is a deciding factor.