The economic importance of the Indonesian coast is significant as a large tidal swampland near the coastal areas has been reclaimed for agricultural purposes. Twenty-five years of swamp reclamation has succeeded in 89,036 ha of swampland in the province of South Kalimantan being reclaimed for agriculture, mainly of rice. These new agricultural areas are now, however, at risk due to sea level rise (SLR). A household survey was carried out to determine the awareness level of farmers of SLR and its effect on the agricultural lands. Out of the total number of 1,222 respondents, only 35% understood SLR and its effects on their rice fields. This indicates a strong need for information dissemination on the SLR issue to farmers in the coastal areas. The geographic information system (GIS) was employed to predict agricultural loss caused by a 0.5–1.0 m SLR. Out of the 13 regencies in South Kalimantan Province, six regencies—Banjar, Banjarmasin, Barito Kuala, Kotabaru, Tanah Bumbu, and Tanah Laut—had agricultural areas that were impacted by SLR. The results of the analysis also revealed that Barito Kuala would experience the largest loss in agricultural production from just a 0.5-m SLR, amounting to IDR 630.26 billion. Another objective of this research was to conduct economic assessments of agricultural adaptation to SLR in South Kalimantan Province, namely the construction of farm dikes and establishing new agricultural areas. The results of the cost-benefit analysis showed that farm-dike installation had positive net present values (NPVs) while the establishment of new agricultural areas produced negative NPVs. This implies that farm-dike establishment is more a worthwhile adaptation strategy for agriculture in response to a SLR of one meter compared to the establishment of new agricultural areas.
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