Lost space as an inhibiting factor for city sustainability

The formation of urban slums is caused by a culture of irregular configuration of land arrangements. Many are found in old cities, does not correspond to urban planning, including in Banjarmasin. Irregularity in land patterns and natural conditions of swamps and river flows, forces organic linear development, following patterns of roads and river flows. The formation of lost spaces makes it difficult to develop sustainable cities. This study aims to see how the pattern of lost space in the city of Banjarmasin causes the formations of irregular areas and spaces within the cityscape, which make the cityscape even worse. The unit of analysis is divided by subdistrict areas. The focus of the research lies in lost space which is categorized based on the level of accessibility that is low or difficult to reach. Data collection methods include, 1) common data collection to reveal preliminary conditions; 2) field observation and literature study; 3) field survey; and 4) mapping and measuring. Data of lost spaces are compiled into 2 parts accordingly to its positions and dimensions. Methods of urban solid and void are used to identify forms of lost spaces. Analysis of lost spaces are categorized in three conditions, 1) mild; 2) moderate; and 3) severe. Almost all districts in Banjarmasin has lost space units; Central Banjarmasin District 87 spots, West Banjarmasin 60, South Banjarmasin 51, North Banjarmasin 62, East Banjarmasin 79. A lot of lost space is located some distance from the main road, while the most size is more than 1000 m 2 . There are 5 types of lost space: square, rectangular, L shaped, U shaped, and irregular. The irregular shape is very dominant. The results of this research show that such a wide lost space, difficult position and irregular shape is very difficult in the arrangement of a sustainable city of Banjarmasin.