From Discworld & Terry Pratchett Wiki
|Geographical Features||Deserts. The river Al'Dente. The occassional oasis. A coast on the Circle Sea with principal ports at El-Kinte and Al-Gebra.|
|Type of government||Ruled by a Seriph, last known: Creosote, from the palace The Rhoxie|
|Notable Citizens||Seriph Creosote, Princes Cadram and Khufurah, 71-hour Ahmed|
|Exports||Klatchian Coffee, figs, tobacco|
|Books||Sourcery, Jingo, The Compleat Discworld Atlas|
The Seriphate of Klatch is a country on the Circle Sea. It is also the name of the continent upon which the country is located. The capital city is Al Khali, and it is ruled by a Seriph. The last named Seriph was Creosote. There is a reference in Maskerade to it having been ruled by a Queen Ezeriel some two hundred years ago.
The country is a large and powerful nation. Despite the claims of certain Morporkians, it is a scientifically advanced nation, responsible for mathematics and astronomy among other inventions.
The country is primarily desert, and popular modes of transport include camels and magic carpets. It has its own Watch of sorts, led by 71-hour Ahmed. Klatch is an economic rival to Ankh-Morpork. Despite this, many Klatchians have emigrated to Ankh-Morpork, bringing aspects of their culture with them. Two that have really caught on include the god Offler and curry.
The Seriphate is an empire with many outlying regions to pacify, but does not encompass the entire Klatchian continent, there being other notable countries including Omnia, Tsort, Ephebe, and Djelibeybi. Klatch the country is militaristically and economically powerful like Tsort and Ephebe, but although all three countries are on the Klatchian coast of the Circle Sea, only Klatch is considered the traditional enemy of the most powerful state across the Circle Sea, Ankh-Morpork.
In The Devil's Dictionary by Ambrose Bierce, he whimsically notes that the letter "K" in the tongue of the Cerathians, a small commercial nation inhabiting the peninsula of Smero, was called Klatch, which means "destroyed". It is inconceivable1 that TP was unaware of this when he chose it as the name of a desert area and country.
1 Well, maybe conceivable: see discussion.