Nagy-Küküllő County  Nagy-Küküllő () was an administrative county (comitatus) of the Kingdom of Hungary. Its territory is now in central Romania (central Transylvania). Nagy-Küküllő is the Hungarian name for the river Târnava Mare. The capital of the county was Segesvár (present-day Sighișoara). Nagy-Küküllő county shared borders with the Hungarian counties Alsó-Fehér, Kis-Küküllő, Udvarhely, Háromszék, Brassó, Fogaras and Szeben. The river Nagy-Küküllő formed part of its northern border, the river Olt part of its southern border. Its area was 3337 km² around 1910. Nagy-Küküllő county was formed when the county of Küküllő was split in 1876, when the administrative structure of Transylvania was changed. In 1920, by the Treaty of Trianon the county became part of Romania. Its territory lies in the present Romanian counties Sibiu (the west), Brașov (the south-east) and Mureș (around Sighișoara). In 1900, the county had a population of 145,138 people and was composed of the following linguistic communities:  Total:   According to the census of 1900, the county was composed of the following religious communities:  Total:   In 1910, county had a population of 148,826 people and was composed of the following linguistic communities:  Total:   According to the census of 1910, the county was composed of the following religious communities:  Total:   In the early 20th century, the subdivisions of Nagy-Küküllő county were: