import type { SeaFeature } from "../sea-names/geometry.ts";
/**
 * How far from a sea, gulf or bay's own point, in kilometres, a point still counts as that water.
 * Each reach is wide enough to cover that water and short of the next named water's point.
 *
 * @example
 * ```ts
 * import { SEA_REACH_KM } from "@johnmorrisdotca/chikyu-earth/place";
 *
 * console.log(SEA_REACH_KM["sea-of-japan"] > 0);
 * ```
 */
export declare const SEA_REACH_KM: Readonly<Record<string, number>>;
/** The named sea, gulf, bay or ocean a point is over, or null when none is within its reach. A smaller water's point is nearer, so it wins over an ocean. */
export declare function waterAt(lon: number, lat: number): SeaFeature | null;