Choosing a Spot That Can Take the Footfall

A good riverside picnic starts with a bit of thought about where you put your blanket. The prettiest bend in the river is often the most fragile: soft banks of sedge and wildflowers that crumble under a few dozen pairs of feet over a summer. Where a path already runs alongside the water, or where a grassy verge has clearly been used for years, you are doing far less harm than by trampling a new route through the reeds.

Look for somewhere with a firm, dry pitch at least a couple of metres back from the water's edge. This keeps bank erosion to a minimum, gives nesting moorhens and mallards a bit of breathing space, and means your sandwiches are less likely to end up in the river when someone leans back. If the bank is steep or the water is deep and fast, move on — a picnic is not worth a soaking, and cold river water is far more dangerous than it looks.

Check the local rules before you go. Many stretches of river in England and Wales are privately owned, and some nature reserves ban picnicking entirely during bird breeding season between March and July. A quick look at the parish noticeboard or the reserve's entrance sign saves an awkward conversation later.

Building a Reusable Picnic Kit

The single biggest source of picnic rubbish is packaging, and almost all of it is avoidable. Build yourself a kit that lives in the boot of the car or on a shelf by the door, so you never have to think about it on the morning itself.

• Containers with lids — stainless steel or sturdy plastic boxes for salads, cheese, olives and dips. They double as plates.
• Beeswax wraps and cloth bags for bread, pastries and loose fruit instead of cling film.
• A flask for tea, coffee or chilled water. A two-litre vacuum flask keeps drinks cold all afternoon and replaces a handful of plastic bottles.
• Real cutlery and enamel plates, plus a couple of tea towels. Enamel is light, cheerful and effectively indestructible.
• Cloth napkins rather than paper ones.
• A large lidded tub for leftovers, and a sturdy rubbish bag — ideally two, one for your waste and one for anything you find.

Weigh your rucksack before you leave. If it feels heavy, that is usually a sign you have packed reusable rather than disposable items, which is exactly what you want. Empty containers weigh much less on the way home.

Buying Food That Hasn't Travelled Further Than You Have

A riverside picnic is a fine excuse to shop locally. Farmers' markets, village shops and farm gates usually sell produce with far less packaging and far fewer food miles than a supermarket equivalent, and the quality is often better for a simple cold spread.

British picnic food is at its best in late spring and summer: new potatoes, radishes, broad beans, strawberries, cherries and a decent truckle of cheese from a county you can nearly see from the riverbank. Take a loaf from a local bakery and ask them to put it in your own bag rather than a paper one. Fill a bottle with tap water at home instead of buying bottled — it tastes no different once it has been chilled in a flask.

Avoid anything that will shed wrappers into the water: individually wrapped biscuits, crisp packets, foil-lidded yoghurt pots. Transfer crisps and nuts into a lidded tub before you leave. If you do buy something packaged, take the packaging home with you. Recycling bins beside rivers are rare, and often overflowing.

On the Bank: Leaving No Trace

The principle is simple: whatever you carry in, you carry out. That includes apple cores, peach stones and crusts. They may look harmless, but food waste attracts rats and gulls, changes the behaviour of local wildlife and takes far longer to break down than most people assume.

A few practical habits make a real difference:

• Do a slow sweep before you leave — bottle tops, hair ties and sandwich crusts hide in long grass.
• Never wash up in the river. Soap, even the eco-friendly sort, upsets the delicate balance of a watercourse. Wipe plates with a cloth and wash them properly at home.
• Keep dogs on a lead near nesting birds and near anglers, and take dog waste home if there is no bin.
• Leave gates as you find them, and stick to stiles and footpaths across farmland.
• No fires or disposable barbecues. They scorch the ground, leave a scar for years and are banned on most riverbanks anyway.

If you have room, take a second bag and pick up a few bits of litter left by others. It takes five minutes and it quietly improves the place for everyone who comes after you.

Getting There and Getting Home

Where you can, walk or cycle to the river rather than driving. A picnic that begins with a mile along a footpath feels like a proper day out, and it saves the awkward business of finding somewhere to park that isn't a farmer's gateway. If you must drive, park considerately, never on verges or in passing places, and check tide times or river levels if you are heading somewhere tidal.

Finally, plan to be home before dusk. Packing up in fading light is when things get left behind, and a forgotten flask or tub on a riverbank is exactly the sort of trace we are trying to avoid. Done well, a riverside picnic leaves the bank looking precisely as you found it — and leaves you with nothing but a full stomach, a bit of sun on your face and the sound of water in your ears.