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Border stones were set up after French - China skirmishes were ended with a peace treaty to mark the Southern border of China. On the stone #1 there are a few plates in English as well with more details about it. Minor curiosity point is that China claims there to have over 18,000 km seashore which would be halfway around the world. This statement is identical in Chinese as well. Bluish statue closeby represents harmony of sea and mountains in making China.