Wien Rundumadum 42km: One of Europe's Flattest Urban-Forest Ultras — D+/km Rank 364 of 390, 57.8% Flat, 42km Through the Vienna Wienerwald

Wien Rundumadum 42km covers 42km with 250m D+ (GPX-verified; official figure flagged for verification). D+/km is 5.95m — ranking 364th of 390 European trail races for climbing density: only 26 races carry less elevation per kilometre. The course runs through Vienna's Wienerwald greenbelt and urban fringe from Sportcenter Donaucity. Terrain: Forest and Urban — a mix of forest paths, city-edge trail, and paved sections. Percent-flat: 57.8% (rank 361/390 — 360 races are more mountainous; 29 are flatter). The biggest single ascent rises 80m at +2.13% average gradient, beginning around km 24.84 (rank 357/390). The biggest single descent drops 69m at -1.49% average gradient from around km 27.93 (rank 365/390). Average uphill gradient: 5.23% (rank 364/390). Average downhill gradient: -5.01% (rank 26/390 on the inverted scale — 26th gentlest). Verify the 2027 course format at wien-rundumadum.at/bewerbe/42-km-einzel/.

Among 390 European trail races, Wien Rundumadum 42km ranks near the very bottom for elevation metrics. D+/km: 364/390 at 5.95m per km (363 races more vertical; only 26 less vertical). Percent-flat: 361/390 at 57.8% (360 more mountainous; 29 flatter). Average uphill gradient: 364/390 at 5.23% (363 steeper; only 26 gentler). Top single ascent: 357/390 at 80m rise. Top single descent: 365/390 at 69m drop. Average downhill gradient: 26/390 inverted (rank 1 = gentlest) — 25 races are gentler on average descent; 364 are steeper. By every metric this is one of the flattest European ultra-distance trail races. The difficulty is not elevation: it is sustaining 42km of continuous aerobic effort with no steep sections to break up the rhythm.

Entry for Wien Rundumadum 42km runs €90 early bird (January 1 to May 31) and €110 standard (June 6 to November 1). Late registration on site adds a further €20 if slots remain. A GPS tracker rental of €15 is mandatory for all participants and is NOT included in the entry fee — it must be paid in cash at check-in. No GPS tracker payment = no race start. Arrive with €15 in cash ready. AUTO €/km: approximately €2.14 at early bird rate (€90 / 42km). The race is not sold out. The 2026 edition was July 11, 2026 (past). Check wien-rundumadum.at for 2027 registration dates and pricing.

Wien Rundumadum 42km runs through the Wienerwald — Vienna's greenbelt forest — and the urban fringe of Austria's capital. The terrain is classified as Forest and Urban: well-maintained forest paths, city-edge trails, and paved sections through Vienna's outer districts. The race is named Rundumadum (around and around) — the full 130km distance completes a full circuit of Vienna, with the 42km, 61km, and 88km distances covering portions of the same loop. Start and finish: Sportcenter Donaucity. Vienna is a UNESCO World Heritage city and one of Europe's premier destinations — the surroundings make for a distinctive race backdrop. The Wienerwald forest paths are well-maintained, runnable, and non-technical, consistent with the race ranking 364/390 for average uphill gradient.

Vienna International Airport (VIE) is approximately 23 minutes from Sportcenter Donaucity — not classified as FAR. Vienna has exceptional public transport: trains, buses, and trams connect the airport and the city seamlessly; a car is not required. Accommodation in Vienna is excellent across all budgets. The 2026 race date was July 11, 2026 (now past). For the 2027 edition, monitor wien-rundumadum.at/bewerbe/42-km-einzel/ for registration opening — early bird pricing typically opens January 1. Wien Rundumadum is a multi-distance festival offering 42km, 61km, 88km, and 130km on the same weekend in July.