the.com/shore
where the ocean writes the same letter to land forever, never expecting a reply
means The land along the edge of a sea, lake, or other large body of water, where it meets the water.
from From Old English 'scora,' related to Middle Dutch 'schore' and Middle Low German 'schor.' The roots are murky, but many trace it back to a Germanic word meaning 'to cut' (a cousin of 'shear' and 'score') — the shore as the line where land is cut off, the place water has trimmed away the edge of the world.
always movingCoastlines shift constantly; maps of them are polite fiction
fractal trickMeasured finer, every coastline grows nearly infinite in length
oldest borderSea-land edge predates every nation and outlives them all
erosion mathSome cliffs retreat over a meter every single year
nautical roots"Off shore" once meant safely beyond reach of land's dangers