Mainau and Reichenau: the flower island and the UNESCO monastic island
The Untersee holds two islands that could not be more different: Mainau, a manicured flower garden you pay to enter, and Reichenau, a quiet World Heritage island of Romanesque churches and market gardens. Knowing which one your day wants — or how to do both — is the whole decision.
Mainau is a garden day out, ticketed and busy
Mainau, the 'Flower Island', is a private garden estate run by the Bernadotte family: a baroque palace and church surrounded by an arboretum, an Italian rose garden, a butterfly house, and seasonal displays that run from spring tulips and rhododendrons to a famous autumn blaze of dahlias. It is reached on foot or by car over a footbridge from the Bodanrück shore near Konstanz, or by BSB boat. Entry is ticketed and the island is deliberately a full half-day or more; check current opening, the seasonal garden calendar, and tickets with Insel Mainau before going, and expect crowds on fine summer days.
Reichenau is a World Heritage landscape, not a garden attraction
Reichenau, joined to the mainland by a causeway, is Mainau's opposite: a flat, working 'vegetable island' whose real monuments are three Romanesque churches — the Minster of St Mary and St Mark at Mittelzell, St Georg at Oberzell with its rare early-medieval wall paintings, and Sts Peter and Paul at Niederzell — the surviving heart of a Benedictine monastery founded in 724 and inscribed by UNESCO in 2000. The island is free to wander and cycle; the churches are the point, best read slowly and with respect for services and visiting terms. It rewards a calmer, more cultural half-day than Mainau.
Pair them or choose by the kind of day you want
The two islands sit close together on the Untersee and can be combined in one full day, ideally Reichenau in the quieter morning and Mainau's gardens after — or you can give each its own half-day at a gentler pace. Choose Mainau for gardens, family appeal, and colour; choose Reichenau for history, quiet, and cycling. Both connect by the BSB ships in season, and both work from a Konstanz base; if you only have time for one and want the deeper Lake Constance story, Reichenau is the one that carries it.
Common mistakes that weaken the trip.
These are planning guardrails, not live availability claims. Current ferry and boat timetables, garden seasons, opening hours, and cross-border rules still belong to official sources.
Arriving at Mainau expecting a free stroll; it is a ticketed garden estate with a full-day scale.
Rushing Reichenau as a photo stop; its value is the three churches and the quiet, not a quick island loop.
Cramming both islands plus a town into a single hurried day and doing none of them justice.
Keep the lake plan coherent.
Move between practical guides by decision type: base and shore, getting around, the islands, the postcard towns, cross-border day trips, and season. Arriving via Munich? Our sister guide at munichguide.app covers the city end of the journey.
Where to stay on Lake Constance: Konstanz, Meersburg, Lindau, Friedrichshafen, or Überlingen
Choose a Lake Constance base by shore and role: lively, well-connected Konstanz, romantic Meersburg, the Bavarian island of Lindau, functional Friedrichshafen, or quieter Überlingen — and when the Swiss or Austrian shore makes more sense.
Getting to and around Lake Constance: airports, trains, the ships, the car ferry, and the bike path
Plan the journey to Lake Constance and how to move once there: Zürich versus Friedrichshafen airports, the rail approaches, the BSB passenger ships, the year-round Konstanz–Meersburg car ferry, the Konstanz–Friedrichshafen catamaran, and the Bodensee-Radweg.
Lindau and Meersburg: the lake's two most photographed towns, done properly
How to plan Lindau and Meersburg without the crowds: Lindau's Bavarian island harbour with its Lion and New Lighthouse, Meersburg's two castles and vineyards above the water, and the timing and access details that make or break each visit.
Current details belong to official sources.
Ferry and boat timetables, garden seasons, opening hours, festival dates, and cross-border rules can change. This page gives the decision frame; the sources below verify current facts.
- Insel MainauThe Flower Island: garden seasons and the dahlia and spring displays, the baroque palace and church, the butterfly house, opening times, tickets, and how to arrive by causeway or boat.
- Reichenau TourismThe monastic island of Reichenau: the three Romanesque churches, the former Benedictine abbey, the market-gardening landscape, and current visitor and access information.
- UNESCO — Monastic Island of ReichenauThe World Heritage inscription (List No. 974, inscribed 2000) for the Monastic Island of Reichenau and its Benedictine monastery and churches.
- Bodensee-Schiffsbetriebe (BSB)The 'Weiße Flotte' scheduled passenger ships between the lake towns, the seasonal timetable, and boat routes and tickets around the Obersee.
- Konstanz TourismKonstanz destination context: the Niederburg old town, the Council of Constance history, the harbour and Imperia statue, and current visitor information for the largest lakeside town.
How we verify
This guide stays source-backed: current boat and ferry timetables, tickets, garden seasons, and cross-border details belong to the official operators before they become planning facts here.