There is no combined visa specifically covering Singapore, Indonesia, Malaysia, and parts of Southern Thailand. Each of these countries requires its own separate visa, although there are some regional agreements or travel programs that may offer easier access between certain countries: 1) Singapore: Requires a separate visa if you're not from a visa-exempt country. Indian passport holders need to apply for a tourist visa in advance. 2) Indonesia: Offers a Visa on Arrival (VoA) for Indian nationals at certain entry points, but it is not part of any combined visa scheme. 3) Malaysia: Indian nationals also need a separate visa to enter Malaysia, which can be obtained via an eVisa or through the Malaysian Embassy. 4) Southern Thailand: While Thailand offers a Visa on Arrival for Indian nationals, there is no combined visa that covers both Thailand and neighboring countries. However, you can look into options like the ASEAN (Association of Southeast Asian Nations) single visa program for certain regions, but it does not include all the countries you've mentioned. The best approach would be to apply for individual visas for each country based on your travel plans. If you're looking for help with visa applications for any of these countries, matrix can assist in processing visas quickly for your trip!