A marsh is a type of wetland that is dominated by herbaceous rather than woody plant species. Marshes can often be found at the edges of lakes and streams, where they form a transition between the aquatic and terrestrial ecosystems. They are often dominated by grasses, rushes or reeds.If woody plants are present they tend to be low-growing shrubs. This form of vegetation is what differentiates marshes from other types of wetland such as swamps, which are dominated by trees, and bogs, which are wetlands that have accumulated deposits of acidic peat.   Marsh is the flagship operation of Marsh & McLennan Companies (MMC), one of the world's largest insurance brokerages. The company brokers insurance and provides risk management and consulting services to corporate clients, government agencies, and other organizations big and small. Marsh has some 25,000 agents and hundreds of brokerage locations in more than 100 countries. Marsh also provides risk financing, insurance program design, and underwriting management, as well as claims administration and technological support services. MMC affiliate Guy Carpenter provides similar brokerage and risk management services to reinsurance companies, other MMC companies include consulting firms Mercer and Oliver Wyman.   Marsh & McLennan Companies, Inc., incorporated on March 17, 1969, is a global professional services firm providing advice and solutions in the areas of risk, strategy and human capital. It is the parent company of a number of risk experts and specialty consultants, including Marsh, the insurance broker, intermediary and risk advisor, Guy Carpenter, the risk and reinsurance specialist, Mercer, the provider of human resource (HR) and related financial advice and services, and Oliver Wyman Group, the management and economic consultancy. The Company provides analysis, advice and transactional capabilities to clients in more than 100 countries. It conducts business through two segments: Risk and Insurance Services includes risk management activities (risk advice, risk transfer and risk control and mitigation solutions), as well as insurance and reinsurance broking and services, and Consulting include retirement, health, talent and investments consulting and services, and specialized management and economic consulting services. In April 2012, it acquired Cosmos Services (America) Inc., the United States insurance brokerage subsidiary of global trading firm ITOCHU Corporation. In September 2012, it acquired Rosenfeld Einstein.