The most amazing thing about nature is its infinite variety. Mountains and plains, grasslands and fields, rivers and lakes are all so different, but equally beautiful. Organizing an outdoor wedding you will have a chance to enjoy the natural ambience, spectacular views and fresh air. Mother Nature gives you a lot of opportunities to realize all your plans and wishes. However, you will have to create exactly what you want from scratch which is definitely a challenge.
To begin with, you should choose a place for your wedding ceremony. Look into which national and public parks in the desired area offer wedding sites for free or for a small permit fee. Or you can decide on unexplored wilderness. The fact that natural settings are available at little or no cost is an apparent advantage of outdoor weddings.
While choosing a place for an outdoor wedding take into account 
your friends' and relatives' budget. Make sure they can afford transportation and accommodation. Advise them of all the expenses unless you are prepared to cover them.
Besides, before choosing some wild or distant place in the middle of nowhere you should find out if there are any motels and hotels available nearby for your out-of-town guests and for yourself if you are honeymooning in the area. Make sure there are all the necessary conveniences and  recreational facilities in the area.
One more issue to consider is weather conditions and climate related issues. Firstly, decide on the season for your wedding. An outdoor wedding comes with the risk of changeable weather, so study the traditional weather patterns of the place you have chosen for your marriage ceremony and listen to weather forecasts. It is important to think about different alternative arrangements you can switch to in emergency, such as tents or heaters in cold weather, or air-conditioners in the heat.
If you  have decided to have a wedding overseas find out beforehand what documents and applications you need to make your marriage legal. Such requirements can vary by country. Make sure you have all the proper paperwork in order to avoid irretrievable mistakes and bitter regrets. Everything should be planned so that there will be no surprises when you are about to give your vows.
While organizing your marriage ceremony do not interfere with nature and avoid polluting the environment. Try to minimize artificial decorations and enjoy the beauty and perfection of the nature.