What does Tianshui County on the tombstone mean?

Place names of these three countries

Jixian County, now southeast of Gangu, Gansu Province, was once called Hanyang County in the Eastern Han Dynasty.

Tianshui is the place name that has been used for the longest time in local history. It began in the third year of Emperor Ding Yuan (1 14). Tianshui is named after the beautiful legend of "Tianhe Water Injection". As far back as 3000 years ago, Tianshui area was densely populated and houses were adjacent, with "beautiful mountains and rivers and dense trees". However, by the end of the Qin Dynasty and the beginning of the Han Dynasty, long-term campaigns, struggles and successive years of drought had turned the prosperous and wealthy Upper City into ruins and the people lived in poverty. Legend has it that one night, while people were sleeping, suddenly the sky was raging, a golden light shone and the ground was red. Suddenly, the earth shook continuously, accompanied by a huge rumble, and a big crack appeared on the ground. I saw the river falling from the sky and pouring into a big crack, thus forming a lake. Quot Tianshui Lake ". Who knows, the water level of this lake is stable, the water quality is pure, sweet and mellow. "Spring does not wither, summer does not overflow, and the four seasons are abrupt. "At that time, people said that the lake was connected with the Tianhe River, also known as the' Tianshuijing'. Later, when the legend was heard by Emperor Wu of the Han Dynasty, he ordered a new county to be built by the lake north of Shangai City, and named it "Tianshui County". Since then, it was named "Tianshui".