|Settled||1974 (as property of the Santos family)|
|Principality of Carlenburg||30 December 2019|
|Province of Ebenthal||19 November 2021|
|• Type||Territory under Federal administation|
|• King's Commissioner||Reinaldo Monteiro|
|• Total||18 (permanent)|
Altentupiland, officialy the Province of Altentupiland (Portuguese: Província de Altentupiland), and formely known as the Principality of Carlenburg, is the one of the three provinces and seven federative units of the Kingdom of Ebenthal. Lanlocked by the Brazilian city of Magé, it is the country's third largest and more populous federative unit, with a total of 18 inhabitants. The province is directly ruled by the federal government through an appointed King's Comissioner, who is currently the former reigning Prince of Carlenburg, Reinaldo (I) Monteiro, King Arthur II of Ebenthal's stepfather. Altentupiland is further subdivided into two municipalites: the capital city of Carlenburg and the city of Telesia. Altentupiland is represented at the House of Councillors by two elected Councillors.
Altentupiland's history pre-dates its micronational history, sheltering Tapuya and later Tupi indians until the arrival of the Portuguese settlers in the late 16th century. As part of the Portuguese colony of Brazil, the lands comprising modern Altentupiland evolved into part of the municipality of Magé when Brazil became indenpendent. In 2019 King Arthur II of Ebenthal annexed modern Altentupilanden territory to the Kingdom of Ebenthal as the autonomous Principality of Carlenburg, following the Nomadic Micronation Theory's principle of sovereignity concession (as King Arthur II is immediate heir to those lands). From the beggining, the principality lacked internal political activity, although it contributed to the national politics through its representatives in the parliament. Recognizing the fait acomplii, in 2021 the Luso-Germanic Cultural Comission, under parliamentary approval and royal assent, abolished Carlenburg's monarchy, subsequently turning the principality into a province under federal control, abolished the city of São Arnaldo, and renamed the city of Teffé to Telesia and the federative unit from Carlenburg to Altentupiland.
The Altentupilanden territory is largely comprised of two large grassy terrains bordering the mountains of Petrópolis, with nine houses in it. The province has a natural source of water and is one of the main sources of income for the maintenance of another province, Lyns. Altentupiland's economy is based on the real estate market (mainly rental of residential properties) and gastronomic tourism, with the capital, Carlenburg, being the third largest gastronomic hub in the country (after Belmonte and Bauernhof-Sant'Anna).
The name Altentupiland is a combination of the German words "Alten" (old) and "Land" (land) with the word "Tupi", meaning "Ancient Tupi land" in reference to the original peoples who inhabited the territory of the modern-day province. The name was created by the Luso-Germanic Cultural Commission to replace the former official proper name "Carlenburg", also German, which means "Carlos' Keep", after Carlos Manoel dos Santos, father to the former prince and present king's commissioner Reinaldo I, who bought those lands.