The Han Dynasty -- Da Wan City

　　Geography position:The big gulf city locates the gansu province black river river with 145 kilometers city northeast in JinTa County shore, east longitude 99 °s is 75 ′s, northern latitudes 40 °s is 38 ′s, the city address place the position is the hungriness district Gobi desert, distributing among them piecemeal feat cultivate of soil.Around rarely bear a dry plant growth.The alongside black river year depend on all the path discharge 1,090,000,000 sign a square rice, correspond a year all discharge 34.6 sign a square rice/second.Measure actually most flood to be worth 900 sign a square rice/second, investigate biggest be worth 1290 sign a square rice/second.(According to town hydrology data)
　　History origin and development:The dollar two years(the first 121 years), go to too early three years(the first 102 years), the dynasty in bar of The Huns clan of into make, at the river west"row four counties according to two passes" of in the meantime, is further to make stronger a border defense, conduct Western Regions, large-scale construct facilitieses, such as pass city, and fortress...etc. in the border district, garrison a soldier, apposition the officer open a dike, immigrating .The big gulf city sets up namely to expect hereat and at that time, going to last years of the period to decline.

　　Ruins general situation:The big gulf city belongs to reside to postpone ruins one part, locating the county city northeast about 145 kilometers black river cross-straitses.The east coast is an east big gulf city, the west coast is a west big gulf city.East the big gulf city is a Han Dynasty shoulder waters all the mansion located, the ruins' scope 350 the ×s is 250 meters, from outside city,inside city and three parts constitute.Inside,the outside city saves a high one meter the or so city wall and two s high set of 7 meters only now.The area 90 the ×s is 70 meters, keep better, the wall fastens the soil plank to build, the layer is thick 0.2 meterses, clipping the stick diameter,0.1-0.2 meter not etc., the stick is apart from 4 meters, going to be apart from 1.7 meters, the west wall leaves ground 5 meters to have results to show the row stick hole, the hole is apart from 0.8 meters.The wall is high 8.5 meterses, the breadth is 4-6 meters, the door is constitute by two 10 ×s 8 meters door in the east wall, door the breadth is 5.2 meters, entering deeply 17.5 meters, there is the ascent way can come a crest, take over the building has already ruin. Inside expect the soil building build three behind.The is on all sides to have two parallel soil walls again, saving the east noodles now a segment, they and of the dike that have together 7 meters, this should be period for Sung,dollar of construct.West the big gulf city be apart from big gulf city of east 2 kilometers, two cities separate river to hope mutually, area 180 the ×s is 210 meters, the wall fastens the soil plank to build, it builds a method together east big gulf city is completely same, the wall the breadth is 8 meters now, crest the breadth is 3.4 meters, the is high 8 meterses, the door has already ruin in the north wall, the breadth is 9 meters, the slope way pass in and out, there is the soil building that two posterities fix in the city, the southeast of the city wall part is hurtle by the river water to ruin.

　　East the big gulf city saves one only now with inside,two s of the outside city high set of 7 meters.The city is high 8.5 meterses, the breadth is 4-6 meters, the east wall contain door, keep better.West big gulf city because of tight depend the black river river near the bank good luck, expand breadth with the nature of the river bed, recent years result in past ddress south,the east wall respectively drive the river water hurtle to ruin 150 meters,125 meterses to damage.

　　Big gulf city the past address is announce by the gansu province people's government to protect unit for the province class cultural object in September in 1981.January of in 1988 is again announce by State Department to protect unit for the third national point cultural object.

　　Protect scope:In August in 1995 people's government in JinTa County's dilimitting the protection scope of the big gulf city definitely is:The past address west,south,north all takes the wall as quasi- expand to postpone 500 meters respectively, the east takes the wall as quasi- expand to postpone 100 meters.(see the gold hair[1995] No.72 document)The gansu province people's government announced same protection scope in March of 1999 again.(see the sweet hair[1999] No.22 document)