An Isotonic Drink Brand's Full Marathon
The Surabaya Isoplus Marathon offers four distances: 5K, 10K, 21.1K and the 42.195K full marathon. [1] Isoplus is an Indonesian isotonic sports drink brand, and the race's name signals a similar hydration-focused sponsorship approach to the Pocari Sweat Run's Bandung leg covered elsewhere in this research -- expect on-course hydration stations to be a specific point of emphasis given the sponsor's core product.
Surabaya: Indonesia's Second City
Surabaya is Indonesia's second-largest city and the capital of East Java province, sitting at the mouth of the Mas River on Java's northern shore, with a population of around three million in the city proper and at least five million across the metro area. [2] That's genuinely major-city infrastructure, making travel, accommodation and race-day logistics considerably more straightforward than at several smaller destinations in this research batch.
Early Bird Registration Open
[1] Given that this is a full-marathon event (a step up from the half-marathon-focused Surabaya Orthopedic Half Marathon covered elsewhere in this batch), it's worth confirming the venue before committing to travel plans.
A Second Surabaya Race in the Same Window
Notably, this marathon shares its 4 October 2026 date with several other races researched in this batch, and Surabaya itself hosts multiple distinct running events (this marathon and the separately organised Orthopedic Half Marathon) -- runners should confirm they're registering for the correct event given the overlapping branding and geography.
Should You Run It?
If you want a full-marathon option in one of Indonesia's most infrastructure-rich cities, with hydration-focused brand backing, the Surabaya Isoplus Marathon on 4 October 2026 is a solid pick -- register during the current Early Bird window for the best pricing. Confirm the exact start venue before finalising travel.